Don't use connect() when the "bind" address is a multicast group

Bug reported by Alexander Gall

modules/misc/network/ipv4.c

@@ -411,8 +411,8 @@ static int OpenUDP( vlc_object_t * p_this )
             }
          }
     }
+    else
 #endif
-
     if( *psz_server_addr )
     {
         /* Build socket for remote connection */

modules/misc/network/ipv6.c

@@ -303,7 +303,7 @@ static int OpenUDP( vlc_object_t * p_this )
             } 
         }
     }
-
+    else
     if( *psz_server_addr )
     {
         int ttl;